This is photo evidence that MK & A have been the queens of boho-chic since they were 8-year-olds. They kept their look simple with sunkissed, bare skin. Mary-Kate sports some bangs, while Ashley keeps hers pulled back.

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As any beauty expert knows, a blunt bob is best accessorized with stunner shades.

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Ah, the '90s: That decade when wearing brown lipstick and a weird, twisted umbrella-like ponytail was cool. Throwback beauty rule you can't miss? Don't forget to leave out exactly two strands of hair to frame and define your face.

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Y2K hair meant a flipped-out bob decorated by tiny clips. Mary-Kate (left) has a shorter, sportier version of Ashley's more dramatic look. The twins are also sporting orange-tinted lipgloss, which goes perfectly with their California tan and blonde locks.

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Ashley, at left, goes for sleek and chic with a smoky cat eye, nude lips, and straight hair. Mary-Kate opted for more drama by drawing her eyeliner a little heavier on the bottom lashes and going with an angular haircut.

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We're starting to see the dawn of boho-chic! (Note the babydoll tops, which were very big in the early aughts.) The girls made nearly identical beauty choices here with beachy waves, smoky eyes, and a peachy lip color.

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This photo hails from the golden age of Olsen twin movies, straight from the set of New York Minute, which was (in our humble opinion) robbed at the Academy Awards. While both girls rock their signature Olsen waves, Mary-Kate (at left) goes for strawberry blonde locks and Ashley (at right) sticks with her true blonde.

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Here begins the part of the evolution where Mary-Kate and Ashley begin to diverge. Mary-Kate has totally ditched the blonde for a gorgeous shade of auburn, which she wears in messy waves and pairs with a dark copper smoky, lined eye. Ashley keeps her hair pulled back in a soft updo and goes for a lighter, golden eyeshadow.

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At the 2005 Met Gala, the girls continue their bohemian reign. A very blonde Ashley wears rimmed eyes and a pink lip, while Mary-Kate wears a similar look, with a smudgier eye and a deeper, berry pout.

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Now that the girls are adapting to cleaner, more minimal fashions, their beauty follows suit. Ashley (left) keeps it simple with longer layers pulled back while shorter pieces frame the face for a romantic effect. Mary-Kate (right) has her hair off to the side and goes for a dramatic black eyeliner smudged out with a taupe eyeshadow.

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What Mary-Kate lost in eyeliner, she gained in mermaid-like hair. Ashley (left) keeps her look modest with beachy waves and a touch of mascara.

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Ashley rocks the crown braid far before it was cool, keeping her bangs loose in front to frame her face and warm the complexion. Meanwhile, Mary-Kate goes for a take on gothic-chic with a darker lip and rimmed eyes.

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The always-more-angelic Ashley takes a punk-rock turn by adding blue streaks to her hair at a party for Tim Burton's exhibit at the Museum of Modern Art in New York City. Meanwhile, Mary-Kate (right) goes for a dark lip and retro curls.

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Now introducing: The Modern Olsens. Thanks to a penchant for luxury clothes, casually effortless (but still gorgeously shiny) hair, nude makeup, and power brows, these are the businesswomen we know today.

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But why not turn it up for a quick occasion? When making a splash as designers extraordinaire at a CFDA party, the girls upped their brow game, while Mary-Kate opted for major volume with her hair.

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Seated front row at the J. Mendel show, the girls are the absolute definition of radiance.

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After winning the 2012 Womenswear Designer of the Year Award for their line The Row, the girls have made fashion history. Also, this might be the only time Mary-Kate (right) experimented with a hair straightener! So, it's also beauty history, in a way. Also, she's brunette, which is pretty and different. Ashley (left) keeps it simple with a low bun pulled back and natural makeup.

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Ashley (left) looks very Kate Moss with her wavy hair left down and a dark smoky eye smudged out from the lash lines. MK opts for an easy high bun and a cat eye.

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Continuing the natural, no-makeup look, Mary-Kate shows up with a messy high bun while Ashley maintains model-off-duty, down strands.

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Since the girls' looks are down pat, we're leaving it up to you to guess: Who's who in this photo? Tell us your thoughts in the comments section!

Beauty

The Beauty Evolution of Mary-Kate and Ashley Olsen

It's double the fun.

Quick question: Who is not obsessed with Mary-Kate and Ashley Olsen? At the tender age of 29, they are two of the most successful women in the fashion industry, what with their ultra-lux line The Row and their contemporary brand Elizabeth and James. But, as legend has it, this dynamic duo didn't exactly get their start behind a sewing machine.

Instead, they took turns portraying the practically iconic Michelle Tanner on Full House, which catapulted them to fame before they could even walk. Then, at just 7 years old, they founded their own company Dualstar, which produced 13 feature films and three TV shows. To date, we've seen them as baby witches, adult witches, detectives, soccer stars, musicians, students, and also your typical teens.

Their unique personal styles have intrigued fans and bloggers all over the world thanks to their complete and utter disregard for conventional fashion rules. Socks with sandals? Yup. Bold eyes and a bold lip? Done. Wearing sunglasses inside? Always, preferably while holding a venti Starbucks cup. Showing major roots before it was cool? Been there. That whole bohemian trend? Their idea.

Sure, you know them as fashion plates. (As you should!) But did you know these sisters have also had quite a beauty transformation over the years? Click through our slideshow to watch them grow up, discover highlights, break up with lip gloss, and more.